Perhaps you should try some spelling variations:
tranh thai » trang thai, tran thi, tinh thai
thai thong » thoai thong, thai hong, thai phong
thong cong » trong cong, tong cong, thong thong
hoc thieu » toc thieu, hoc hien
hach toan » thanh toan, manh toan
ho chieu » theo chieu, doi chieu, mot chieu
tac toan » tap toan, tam toan, tich toan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) or (hoc thieu)) xanh - canh tranh thai thong cong ((tac toan) OR (hach toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (hoc thieu)) xanh - canh tranh thai thong cong ((tac toan) OR (hach toan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (hoc thieu)) xanh - canh tranh thai thong cong ((tac toan) OR (hach toan)) cau".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (hoc thieu)) xanh - canh tranh thai thong cong ((tac toan) OR (hach toan)) cau*.